This IBM Thinkpad replacement laptop battery features Li-ion chemistry within its cells. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to memory effect common with older battery chemistry nor do they contain the toxic chemicals found in some older battery technologies. This laptop battery replacement is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty. Fits these IBM laptops: IBM ThinkPad 380 - Not compatible with IBM Thinkpad 380CE CS CSE models. this is a Li-ion battery rated at 10.8V and 4000 mAh capacity. Compatible with IBM notebook battery part numbers: 02K6503, 02K6517, 02K6516, 02K6509, 73H9951, 73H9861

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